So the waveform collection wouldnt be complete without the 50Hz AC Mains. Since the oscilloscope I am currently using is USB powered PC based, it can't handle high voltages such as the 230 Volts AC/Hz available in India.
So I stuck my probes onto the secondary of a AC/DC step down adapter..
..connected the oscilloscope to my laptop and observed the waveform and more specifically, its frequency:
![](http://lh4.ggpht.com/_57WjJKbJtcc/TKjJGBK38gI/AAAAAAAAEDA/TBfjYk9Yhiw/s400/Clipboard012.jpg)
Just to be safe, I operated the laptop on battery and disconnected the laptop charger from the mains.
Next I loaded the AC/DC adapter with a 47 ohms resistor...
.. and observed the signal (note the distortion):
![](http://lh6.ggpht.com/_57WjJKbJtcc/TKjJGPQFYoI/AAAAAAAAEDE/633Zk6tO3Xc/s400/Clipboard01.jpg)
If you are wondering if (and why) the utility frequency ever changes then the following articles would interest you:
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